Marcus Tavernier - a former Academy player with the Magpies - struck first for the Cherries just after the half-hour mark.
Jacob Ramsey, Harvey Barnes and Anthony Elanga came into the side and two of them were involved in the first opening of the afternoon, in the fifth minute.
Elanga played the ball out to William Osula on the right and, after a series of stepovers, he found Barnes but the winger dragged his shot wide.
Midway through the first half, the floodgates momentarily began to open in terms of the weather but not in terms of goalmouth incident, although Tavernier - younger brother of former Magpies defender James - shot into the side-netting under pressure from Tino Livramento.
Then in the 27th minute Rayan side-footed wide from 18 yards after Bournemouth won possession and worked the ball from left to right.
But Rayan set up the opener soon afterwards, getting to the byline and crossing low from the right for Tavernier to bundle home.
Bruno Guimarães returned to the squad after injury but Joelinton was suspended - this was the first game of a two-match ban for accumulating ten bookings - and Anthony Gordon missed out with a minor hip flexor injury.
The fixture was dedicated to celebrating diversity and inclusion, in support of the No Room For Racism and Show Racism the Red Card campaigns, and Wor Flags paid tribute to the club's first 11 black players - Howard Gayle, Tony Cunningham, Mirandinha, Franz Carr, Justin Fashanu, Andrew Cole, Ruel Fox, Les Ferdinand, Shaka Hislop, Tino Asprilla and John Barnes - ahead of kick-off.
**Newcastle United:** Aaron Ramsdale, Lewis Hall, Sven Botman, Sandro Tonali (c), Harvey Barnes, Malick Thiaw, William Osula, Anthony Elanga, Tino Livramento, Jacob Ramsey, Lewis Miley
**Subs not used:** Nick Pope, Kieran Trippier, Yoane Wissa, Jacob Murphy, Nick Woltemade, Joe Willock, Dan Burn, Alex Murphy, Bruno Guimarães